调色到底是在改场景，还是改屏幕？When you grade, are you changing the scene or the screen?
这两个词不只是色彩管理术语。它们决定了你调曝光时是在移动"场景里的光"，还是在修改"某台屏幕上的成片外观"。理解这一点，Log、ACES、DaVinci Wide Gamut、Rec.709 和 HDR 输出可以被放进同一条工作链路中分析。 These two terms aren't just color-management jargon. They decide whether, when you adjust exposure, you're moving "the light in the scene" or editing "how the final picture looks on one particular screen". Once this clicks, Log, ACES, DaVinci Wide Gamut, Rec.709, and HDR output all fit into one pipeline you can reason about.
1. 先把问题换一种问法1. First, ask the question differently
不要先问"这个素材是什么色彩空间"。更好的问题是：这个图像现在处在什么状态？它的数字参照的是现场光，还是目标显示器？同一个 0.5，在不同状态下含义完全不同。
Don't start by asking "what color space is this footage". A better question is: what state is this image in right now? Do its numbers refer to the light on set, or to the target display? The same 0.5 means completely different things in different states.
参照拍摄现场或虚拟场景Referenced to the set or a virtual scene
它保留"比 18% 灰高几档""灯比墙亮多少倍"这类曝光关系。RAW、Linear EXR、ACES、LogC、S-Log3、V-Log 都属于这个大思路，只是有的线性，有的是 Log 编码。It preserves exposure relationships like "how many stops above 18% grey" or "how many times brighter the lamp is than the wall". RAW, Linear EXR, ACES, LogC, S-Log3, and V-Log all follow this idea — some linear, some Log-encoded.
参照目标显示器最终发光Referenced to the target display's final light
它已经为 Rec.709 100 nit、P3 影院、sRGB 网页或 PQ HDR 1000 nit 这类目标做过渲染。此时数字更接近"屏幕应该怎么亮"，而不是"现场原来多亮"。It has already been rendered for a target like Rec.709 100 nit, P3 cinema, sRGB web, or PQ HDR 1000 nit. Here the numbers are closer to "how the screen should glow" than "how bright the scene originally was".
告诉软件素材原本怎样编码：S-Log3/S-Gamut3.Cine、LogC4/AWG4、BRAW Gen 5 等。Tells the software how the footage was originally encoded: S-Log3/S-Gamut3.Cine, LogC4/AWG4, BRAW Gen 5, etc.
把素材放进统一的宽色域工作空间，例如 ACEScct 或 DaVinci Wide Gamut Intermediate。这里不是显示端，不使用 BT.1886、PQ 这类 EOTF；它使用的是工作空间自己的编码/传递函数，最后再由 Output Transform 转到目标显示 EOTF。Puts footage into one unified wide-gamut working space, like ACEScct or DaVinci Wide Gamut Intermediate. This isn't the display side, so it doesn't use display EOTFs like BT.1886 or PQ; it uses the working space's own encoding/transfer function, and the Output Transform later converts to the target display EOTF.
通过 tone mapping、gamut mapping、色貌调整，把场景状态变成可看的显示状态。Through tone mapping, gamut mapping, and color-appearance adjustments, turns the scene state into a viewable display state.
编码成 Rec.709、sRGB、P3、PQ HDR 或 HLG。这个版本通常已经是 display-referred。Encodes to Rec.709, sRGB, P3, PQ HDR, or HLG. This version is usually already display-referred.
2. 三种图像状态，不要混成两个词2. Three image states — don't collapse them into two terms
"Scene-referred vs Display-referred"最容易误解的地方，是把 scene-referred 当成 scene-linear。实际上 Log 也是 scene-referred，只是它不是线性光。The easiest misunderstanding of "scene-referred vs display-referred" is treating scene-referred as scene-linear. In fact Log is also scene-referred — it just isn't linear light.
线性场景光Linear scene light
数值和场景光强成正比。2.0 真的是 1.0 的两倍光。常见于 Linear EXR、ACES2065-1、ACEScg、CG 渲染与合成。Values are proportional to scene light intensity. 2.0 really is twice the light of 1.0. Common in Linear EXR, ACES2065-1, ACEScg, and CG rendering/compositing.
优势：物理运算直觉清晰。风险：动态范围大，需要浮点或高位深。Strength: physically intuitive math. Risk: large dynamic range, needs float or high bit depth.
场景光的非线性编码Non-linear encoding of scene light
LogC、S-Log3、V-Log、Log3G10 仍然参照场景曝光，但用对数曲线把高光压进有限码值。LogC, S-Log3, V-Log, and Log3G10 still reference scene exposure, but use a log curve to fit highlights into limited code values.
优势：适合相机记录与调色。风险：直接看会灰，必须配对应 Gamut。Strength: good for camera recording and grading. Risk: looks grey if viewed directly; must be paired with the right gamut.
已经面向目标显示渲染Already rendered for the target display
Rec.709 成片、sRGB 图片、P3 交付、PQ HDR master 通常都属于这里。数字已经服务于"看起来怎样"。A finished Rec.709 cut, an sRGB image, a P3 delivery, or a PQ HDR master usually belong here. The numbers already serve "how it looks".
优势：所见接近交付。风险：跨显示复用和二次调色空间更小。Strength: what you see is close to the delivery. Risk: less room for cross-display reuse and re-grading.
| 问题Question | Scene-referred | Display-referred |
|---|---|---|
| 数字参照什么？What do the numbers refer to? | 场景光、曝光关系、相对中灰Scene light, exposure relationships, relative mid-grey | 目标显示器的发光和观看条件The target display's light output and viewing conditions |
| 能否超过 1？Can it exceed 1? | 可以，尤其在线性/浮点工作空间里很常见Yes — very common in linear/float working spaces | 交付码值通常限制在目标范围内Delivery code values are usually limited to the target range |
| 适合做什么？What is it good for? | 曝光、白平衡、镜头匹配、合成、Look、多输出Exposure, white balance, shot matching, compositing, looks, multiple outputs | 最终微调、广播交付、网页图片、单一 SDR 快速交付Final tweaks, broadcast delivery, web images, quick single-SDR delivery |
| 典型例子Typical examples | RAW, Linear EXR, ACEScg, ACEScct, DWG Intermediate, LogC, S-Log3, V-Log | Rec.709 Gamma 2.4、sRGB、Display P3 交付、PQ HDR masterRec.709 Gamma 2.4, sRGB, Display P3 delivery, PQ HDR master |
3. 互动：一条素材在链路里换了几次身份3. Interactive: how many identities one clip takes on across the pipeline
点击不同工作流，看同一条素材在输入、工作空间、调色、输出变换和交付阶段的状态。真正的色彩管理不是"套 LUT"，而是明确每一步的图像状态。Click through the workflows to see one clip's state at the input, working-space, grading, output-transform, and delivery stages. Real color management isn't "slap on a LUT" — it's being clear about the image state at every step.
4. Output Transform 不是风格 LUT4. The Output Transform is not a creative LUT
ACES 文档把 Output Transform 描述为：把 scene-referred ACES 数据一致、可预测地转成适合特定显示设备和观看条件的输出图像。OCIO 里类似的东西叫 View Transform，ARRI 也明确说 Log C 要正确显示到 Rec.709、Rec.2020 或 P3，需要 tone-map 并转换到目标色彩空间。The ACES docs describe the Output Transform as converting scene-referred ACES data, consistently and predictably, into an output image suited to a specific display device and viewing condition. The OCIO equivalent is the View Transform, and ARRI states plainly that displaying Log C correctly to Rec.709, Rec.2020, or P3 requires tone-mapping and conversion to the target color space.
此图是教学示意：真实 ACES、Resolve、ARRI 或厂商 DRT 的 tone scale 和 gamut mapping 会更复杂。这里重点展示"同一场景范围在不同显示目标下必须被重新渲染"。This chart is a teaching illustration: the tone scale and gamut mapping in real ACES, Resolve, ARRI, or vendor DRTs are more complex. The point here is that "the same scene range must be re-rendered for different display targets".
高光怎么卷How highlights roll off
把场景里可能超过显示峰值的亮度压进 100 nit、48 nit 或 1000 nit。Compresses scene brightness that may exceed the display peak into 100 nit, 48 nit, or 1000 nit.
饱和度怎么保How saturation is preserved
好的显示渲染会避免高光颜色粗暴变白，也避免广色域颜色直接裁切。Good display rendering avoids crudely whitening highlight colors and avoids hard-clipping wide-gamut colors.
色域怎么压How gamut is compressed
工作空间可能比 P3、Rec.709 大得多，出界颜色要被映射到可显示范围。The working space can be much larger than P3 or Rec.709, so out-of-gamut colors must be mapped into the displayable range.
最后怎么编码How it's finally encoded
Rec.709 Gamma 2.4、sRGB、PQ、HLG 是不同的显示编码和观看假设。Rec.709 Gamma 2.4, sRGB, PQ, and HLG are different display encodings with different viewing assumptions.
5. 在 Resolve 里怎么落地5. How it plays out in Resolve
Resolve 里最重要的是把三件事分开：输入素材怎么解释、调色发生在哪个工作空间、最后输出到哪种显示。你可以用项目级 RCM，也可以用节点级 CST，但逻辑是同一套。The key in Resolve is to separate three things: how input footage is interpreted, which working space grading happens in, and which display it finally outputs to. You can use project-level RCM or node-level CSTs, but the logic is the same.
S-Log3 → DWG Intermediate → Output
S-Log3 → Rec.709 LUT → Rec.709 调色grade
IDT → ACES 工作空间working space → LMT / Grade → Output Transform
ACES 的核心是把不同相机和 CG 输入统一到 scene-referred ACES 编码，再通过 Output Transform 输出到特定显示设备。旧文档里常见 RRT + ODT，新 ACES 文档更倾向把整体称为 Output Transform。The core of ACES is unifying different camera and CG inputs into a scene-referred ACES encoding, then outputting to a specific display via the Output Transform. Older docs often show RRT + ODT; newer ACES docs prefer to call the whole thing the Output Transform.
6. 最常见的误区6. The most common myths
这几个误区会直接导致调色链路错位：把 Log 当滤镜、把 LUT 当色彩管理、把 Rec.709 当成错误、把 PQ HDR 当成 scene-referred。These myths directly throw the grading pipeline out of alignment: treating Log as a filter, a LUT as color management, Rec.709 as a mistake, or PQ HDR as scene-referred.
资料来源Sources
这一章的重点来自 ACES、OpenColorIO、ARRI、Blackmagic 和 HDR 标准文档对 scene/display、Output Transform、View Transform 和 Log 显示转换的定义。This chapter draws mainly on how ACES, OpenColorIO, ARRI, Blackmagic, and HDR standards define scene/display, the Output Transform, the View Transform, and Log-to-display conversion.